PB. MK4 Upgrade kit

Step 1 Disassemble your PrusaBox MK3:

– Remove the doors

– Disconnect LED and fan, and remvove Inside spool holder if you have them

– Unscrew uprights on the plateform, and remove the top of the PrusaBox

– Remove completely uprights from the top metal frame

– Keep your new MK4 control panel free from printed parts

Step 2 Installing uprights (1/3)

If you chose stainless steel edition, remove plastic protection.

Left back uprights

Right back uprights

Turn the top of the printer-box over (outer side against the table).

Slide left rear upright from the top with printed corners inserted on the upright.

Then you can slide down the upright. 

You succeeded if left and right hooks are in place and there is no gap on the top.
If not, go back to (yellow arrow).

Tighten left rear upright with 4 M4 screws.

Tighten right rear upright with 4 M4 screws.

Depending on how the the corner pieces were printed, you may have to force a little.

Step 3 Installing uprights (2/3)

Place the roof on the back uprights that you assembled on the previous step.

Step 4 Installing uprights (3/3)

Front right upright

Front left upright

Position right upright in front of  corner piece as shown.

Slide right front upright so that it clips to the top of the printer-box.

Fix right front upright with 3 M4 screws.

Fix left front upright with 3 M4 screws.

Step 5 Fitting the fixed hinges (1/2)

Start by sorting the fixed hinges:

Hinges type A

Hinges type B

Insert M3 square nuts in all hinges

Insert 3mm pins in all hinges.

Hinges should be inserted as showned.

Step 6 Fitting the fixed hinges (2/2)

Assemble hinges type B for the left door and on the inside, the vertical cable mounts using 4 M3x12 screws.

Assemble hinges type B for the front left door.

Assemble hinges type A for the front right, top, back and right doors.

Fix each fixed hinge with 2 M3x6 screws by screwing from the inside.

You can already install the webcam rail on the front-right upright part.

Step 7 Preparation of the Plexiglass sheets

Kit includes 7 plexiglass sheets (6 for upgrade kit):

2pcs for side doors 

1pc for back door

1pc for top door

2pcs for double front door

1pc for sealing of front door

Remove the protective films from the Plexiglas sheets.

Step 8 Preparation of doors printed parts and doors handles

 Hinges type A and B (4xA and 2xB in upgrade kit)

Top door handles (not in upgrade kit)

Front door magnet holders

Back doors locks

Front handles

Insert M3 square nuts into each slot

Step 9 Mounting back and top doors

Top door, check hinge and handle side regarding asymetrical distance.

Front and back doors are the same, check hinge and lock side regarding asymetrical distance.

Assemble 2 type A hinges with 4 M3x6 screws on those doors. Double check to fix it with screw head against table.

Assemble locks on back door with 2 M3x12 screws. Double check to assemble it with screw head against table.

Tighten the bolts of the locks sufficiently so that there is a slight resistance but not too much so that the lock is not too hard to open.

Step 10 Front doors

Position the two doors in order to have them like in the picture. Be careful about the asymetrical distance of the hinges.

Add on top of the right door, the plexiglass little part. It is used to seal the gap between doors when closed.

Tighten hinges and handles using M3 screws.

Add magnets inside magnet holder, and position them where they belong (see picture). Tighten them with M3 screws.

Step 11 Right door

Insert M3 square nuts into each slot.

Insert 6 magnets into the big slots: don’t hesitate to slightly push them at the bottom of the slot.

Put on the table all parts as shown on the picture: all writings must be against the table.

Be carefull to R2 orientation : handles and growth must be on the outside.

Place the Plexiglass sheet on top of it, and screw lightly using M3*12 screws. If you screw to hard, you might bend the sheet.

Step 12 Left door

Insert M3 square nuts into each slot.

Insert 6 magnets into the big slots: don’t hesitate to slightly push them at the bottom of the slot.

Put on the table all parts as shown on the picture: all writings must be against the table.

Be carefull to R2 orientation : handles and growth must be on the outside.

Place the Plexiglass sheet on top of it, and screw lightly using M3*12 screws. If you screw to hard, you might bend the sheet.

Step 13 Control panel

Step 14 Final assembly

– Assemble top and plateform

– Connect again fan and LED

– Hide cables behing the vertical cable rail

– And add the doors!

Congratulation!